CompM5 or Micro T-2 for patrol — sight picture, weight, and the things people skip

Question

I want to be careful here—duty use and civilian carry are different problems, and optics selection lives at that intersection.

Both are solid choices. The CompM5 gives you a larger sight picture and a true 50k battery life under normal use. The Micro T-2 is lighter and more compact, which matters if you're running a short-barrel or CQB setup. Battery life on the T-2 is rated around 50k as well in optimal conditions, though I've seen field reports that vary depending on brightness settings.

For duty, here's what I'd weigh:

1. On a standard 16-inch patrol rifle, the CompM5 footprint isn't a liability. You're not sacrificing real estate or adding meaningful weight—we're talking ounces either way.

2. The larger optic body on the CompM5 gives better co-witness height with standard AR irons if you ever need to run both. That matters if your department qualifies with irons as a backup.

3. Battery access. The CompM5 uses AA. The T-2 uses a 2032. In a duty context, AA availability in a patrol vehicle or station is the realistic standard.

4. Retention on your mount is the same either way—that's on the mount, not the optic.

If your rifle is already set up and running, I wouldn't change it. If you're building, the CompM5 is the simpler choice for duty work. The T-2 makes sense if you're running a specialized platform or weight is a constraint.

What's your current setup?

Ben Rourke · Accepted Answer

frm42's right on the mount-height math—I was conflating optic body with sight radius, and that's worth clearing up.

But I want to push back a little on how that plays out in practice for a duty rifle. Yes, the mount height is the primary driver. What I've seen on range with department shooters is that the CompM5's longer tube—that 5.5" sight radius frm42 mentioned—does something the numbers don't fully capture: it gives you a reference plane that's easier to anchor consistently under stress. Smaller optic window can mean fewer visual anchors when you're running quals in low light or moving between distances quickly.

That said, the T-2 wins on weight distribution if you're talking a 14.5" pinned or a 10.3" short upper. The CompM5 isn't heavy, but on a shorter barrel where you're already fighting the front-heavy tendency of a short dwell tube, the T-2 cleans that up noticeably. Felt balance matters more than spec sheet weight does.

The battery thing—frm42's point about checking what your unit stocks is solid. That's a ten-minute conversation with your armorer that beats any forum assumption.

I'd split the difference here: if you're running a standard 16-inch carbine or mid-length, the CompM5 is the easier sell for consistency across shooters and standardization. If your rifle is already a short-barrel setup or you're building something specialized, the T-2 earns its spot. Either way, test both on your actual mount before deciding. What barrel length are you working with?

Ari Rosen · Answer

The co-witness question hinges on mount height, not optic body size—worth untangling that first.

If you're running a standard 1.93" or 2.26" mount, the CompM5 and T-2 will co-witness with A2-height rear sights identically. The optic body diameter (30mm vs 24mm) doesn't change where the reticle sits relative to your irons. What *does* matter is the mount you select and whether your front sight tower clears the optic window—and both of these optics have large enough windows that this isn't a real constraint on any AR platform I've tested.

Where mount height actually gets you: a lower mount (1.5") closes the gap to irons more; a higher mount (2.26") increases it. The optic itself is neutral to that calculation.

On battery logistics—you're right that AA is easier to stock. But I'd check what your department's actual patrol inventory is before deciding on that alone. Some units standardize on CR2032 across optics, lights, and PEQs. Worth asking.

The real geometric difference: CompM5 has a longer sight radius from rear lens to reticle (about 5.5"), which gives you a marginally tighter sight picture at distance. T-2's compact window (24mm) means less peripheral fill, which some shooters find cleaner in close work. Not a duty-breaker either way.

My recommendation for your specific use case: measure your current mount height and test both optics on that exact setup if possible. The mount choice matters more than the optic choice here.

Sgt. Danny Prater · Answer

Both of you are working real data here, and it matters for the right reasons.

I'll add the piece I see come up in duty quals and low-light scenarios: the CompM5 window real estate becomes an asset when you're transitioning between distances fast or working in less-than-ideal light. That larger sight picture isn't just comfort—it's repeatability under fatigue. We run guys through contact-distance drills and then 50-yard groups back-to-back. The CompM5 gives shooters a cleaner reset between those jumps, especially when you're running them in sequence without adjusting brightness.

On weight distribution, ben.rourke's absolutely right about the short-barrel math. But I'd frame it differently for duty context: if you're carrying a 16-inch patrol rifle, you're not in a short-dwell weight fight. The CompM5 adds nothing meaningful to your carry profile. For most departments, standardization across the patrol fleet matters more than shaving a few ounces off an individual gun.

The battery question—frm42 nailed it. Check with your armorer before you spec the optic. I've seen units go all-in on 2032s, others stick AA across the board. It's a ten-minute conversation that beats assumptions.

If you're building or replacing: CompM5 on a standard rifle is the lower-friction choice. Test both on your actual mount and run a few low-light quals if you can. That's the decision that matters, not the spec sheet. What does your dept currently run on patrol rifles?